Question

我对我的previous issue有部分解决方案正确显示帖子#index和posts＃show routes，但在创建帖子后窒息：

  PostsController中的
ActionController :: UrlGenerationError #create
  没有路由匹配{：action =＆gt;“show”，：controller =＆gt;“posts”}缺少必需的密钥：[：id，：month，：year]

提取的来源（第32行）：
  30 respond_to do | format |
  31 if @ post.save
  32 format.html {redirect_to post_path，注意：'帖子已成功创建。' }
  33 format.json {render：show，status :: created，location：@post}
  34别的
  35 format.html {render：new}

...并编辑帖子：

没有路线匹配[PATCH]“/ blog / example-post / blog / 2015/09 / example-post”

以下是所有相关文件（使用相同的非常简单的脚手架博客）：

$ rails new blog
[...]
$ cd blog
# (Add friendly_id to Gemfile & install)
$ rails generate friendly_id
$ rails generate scaffold post title content slug:string:uniq
[...]
$ rake db:migrate

的routes.rb

Rails.application.routes.draw do
  scope 'blog' do
    get     '',                   to: 'posts#index',  as: 'posts'
    post    '',                   to: 'posts#create'
    get     '/new',               to: 'posts#new',    as: 'new_post'
    get     '/:id/edit',          to: 'posts#edit',   as: 'edit_post'
    get     '/:year/:month/:id',  to: 'posts#show',   as: 'post'
    patch   '/:id',               to: 'posts#update'
    put     '/:id',               to: 'posts#update'
    delete  '/:year/:month/:id',  to: 'posts#destroy'
  end
end

post.rb

class Post < ActiveRecord::Base
  extend FriendlyId
  friendly_id :title, use: :slugged

  def year
    created_at.localtime.strftime("%Y")
  end

  def month
    created_at.localtime.strftime("%m")
  end
end

posts_controller.rb

class PostsController < ApplicationController
  before_action :set_post, only: [:show, :edit, :update, :destroy]

  def index
    @posts = Post.all
  end

  def show
    @post = Post.friendly.find(params[:id])
  end

  def new
    @post = Post.new
  end

  def edit
    @post = Post.friendly.find(params[:id])
  end

  def create
    @post = Post.new(post_params)

    respond_to do |format|
      if @post.save
        format.html { redirect_to post_path, notice: 'Post was successfully created.' }
        format.json { render :show, status: :created, location: @post }
      else
        format.html { render :new }
        format.json { render json: @post.errors, status: :unprocessable_entity }
      end
    end
  end

  def update
    respond_to do |format|
      if @post.update(post_params)
        format.html { redirect_to post_path, notice: 'Post was successfully updated.' }
        format.json { render :show, status: :ok, location: @post }
      else
        format.html { render :edit }
        format.json { render json: @post.errors, status: :unprocessable_entity }
      end
    end
  end

  def destroy
    @post.destroy
    respond_to do |format|
      format.html { redirect_to posts_url, notice: 'Post was successfully destroyed.' }
      format.json { head :no_content }
    end
  end

  private
    # Use callbacks to share common setup or constraints between actions.
    def set_post
      @post = Post.friendly.find(params[:id])
    end

    # Never trust parameters from the scary internet, only allow the white list through.
    def post_params
      params.require(:post).permit(:title, :content, :slug)
    end
  end
end

posts_helper.rb

module PostsHelper

  def post_path(post)
    "blog/#{post.year}/#{post.month}/#{post.slug}"
  end

end

应用程序/视图/帖/ index.html.erb

<p id="notice"><%= notice %></p>

<h1>Listing Posts</h1>

<table>
  <thead>
    <tr>
      <th>Title</th>
      <th>Content</th>
      <th>Slug</th>
      <th colspan="3"></th>
    </tr>
  </thead>

  <tbody>
  <% @posts.each do |post| %>
    <tr>
      <td><%= post.title %></td>
      <td><%= post.content %></td>
      <td><%= post.slug %></td>
      <td><%= link_to 'Show', post_path(post) %></td>
      <td><%= link_to 'Edit', edit_post_path(post) %></td>
      <td><%= link_to 'Destroy', post, method: :delete, data: { confirm: 'Are you sure?' } %></td>
    </tr>
  <% end %>
  </tbody>
</table>

<br>

<%= link_to 'New Post', new_post_path %>

总之，这是有效的：

/博客/索引
/博客/ 2015/09 /实例-交
创建一个新帖子（直到它应该重定向到帖子的位置＃显示当你得到上面提到的UrlGenerationError时）
- 那就是说，新帖子被添加到数据库中，所以如果你回到/索引新帖子就会显示
销毁帖子

......什么行不通：

编辑帖子（带有表单的编辑页面将呈现，但在提交更改后，您将收到上述错误 - 并且更改永远不会进入数据库）
创建新帖子后完成重定向（前面提到过）。
/博客/ 2015 /索引
/博客/ 2015/09 /索引

我很激动我已经走到了这一步 - 任何解决这些悬而未决问题的指导都会非常感激！

修改

感谢@ brad-werth，通过以下更改修复了帖子创建：

posts_controller.rb

def create
  @post = Post.new(post_params)

  respond_to do |format|
    if @post.save
      format.html { redirect_to post_path(@post.year, @post.month, @post), notice: 'Post was successfully created.' }

我也尝试过以下方式解决帖子编辑问题：

将编辑路线更改为get '/:year/:month/:id/edit', to: 'posts#edit', as: 'edit_post'并将以下覆盖添加到posts_helper.rb以防止索引页面中断：

  def edit_post_path(post)
    "#{post.year}/#{post.month}/#{post.slug}/edit"
  end

现在，索引页面中的“编辑”链接将转到正确的网址（/blog/2015/09/example-post/edit - 它曾用于/blog/example-post/edit）并成功呈现编辑页面。但这会导致PATCH中断（实际上，更新不会进入数据库）：

No route matches [PATCH] "/blog/2015/09/example-post/blog/2015/09/example-post"

我认识到这个重复问题可能在于此edit_post_path覆盖，但以下尝试强制使用正确的PATCH路由无效：

更新PATCH路由至patch '/:year/:month/:id', to: 'posts#update'
将更新后的PATCH路由命名为as: 'patch'，并将PATCH路径覆盖添加到posts_helper：
```
def patch_path(post)
  "#{post.year}/#{post.month}/#{post.slug}"
end
```
将覆盖更改为：
```
def patch_path(post)
  ""
end
```
Un-name＆amp;将PATCH路线更改为patch '', to: 'posts#update'

看看posts_controller，它看起来不像问题，因为它不是重定向不是问题 - 我不明白为什么@post.update(post_params)会有问题：

  def update
    respond_to do |format|
      if @post.update(post_params)
        format.html { redirect_to @post, notice: 'Post was successfully updated.' }
        format.json { render :show, status: :ok, location: @post }
      else
        format.html { render :edit }
        format.json { render json: @post.errors, status: :unprocessable_entity }
      end
    end
  end

因此，我可以告诉URL中的重复发生在PATCH操作之前，这会将我们带回EDIT流程 - 它必须将复制传递给PATCH，它会导致阻塞。想法？

Answer 1

您的错误说明：

No route matches {:action=>"show", :controller=>"posts"} missing required keys: [:id, :month, :year]

正如您在失败的行format.html { redirect_to post_path, notice: 'Post was successfully created.' }中看到的那样，您在没有参数的情况下调用post_path。

您的路线get '/:year/:month/:id', to: 'posts#show', as: 'post'需要年，月和身份证明。这与您上面的错误消息一致。

要修复，只需提供缺少的参数，如下所示：

format.html { redirect_to post_path(@post.year, @post.month, @post), notice: 'Post was successfully created.' }

Answer 2

更新和创建操作更改：

format.html { redirect_to post_path, notice: 'Post was successfully ...' }

与

format.html { redirect_to @post, notice: 'Post was successfully ...' }

#YYYY / MM / Title-Slug URL结构，带有#new和#edit

的routes.rb

post.rb

posts_controller.rb

posts_helper.rb

应用程序/视图/帖/ index.html.erb

2 个答案: